High efficiency silver catalyst for the production of ethylene oxide via ethylene oxidation
US5063195A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Feb 1, 1989 |
| Grant date | Nov 5, 1991 |
| Priority date | — |
| Expiry date | Feb 1, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/52
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for preparing silver-containing catalysts and their carriers for the production of ethylene oxide via ethylene oxidation and also to the applications of said catalysts in producing ethylene oxide. Commercial trihydrated .alpha.-alumina, boehmite, carbonaceous materials, a fluxing agent, fluoride and a binder are mixed with water, kneaded and extruded to form strips which are cut and shaped. The shaped bodies are dried, calcined and converted to a .alpha.-alumina bodies i.e., carriers. This process is characterized by using trihydrated .alpha.-alumina, boehmite alumina and carbonaceous materials which have a good matching of particle sizes and proportions in preparing alumina carriers with the following pore structure: ______________________________________ specific surface area 0.2-2 m.sup.2 /g pore volume >0.5 ml/g pore radius >30.mu., 25-10% of total volume <30.mu., 75-90% of total volume. ______________________________________ The alumina carriers are impregnated with silver compounds and promoters, and then dried, activated and used in ethylene oxidation for making ethylene oxide. The selectivity of the catalyst reaches from 83 to 84 percent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.